node_modules/ast-types/def/jsx.js

module.exports = function (fork) {
    fork.use(require("./es7"));

    var types = fork.use(require("../lib/types"));
    var def = types.Type.def;
    var or = types.Type.or;
    var defaults = fork.use(require("../lib/shared")).defaults;

    def("JSXAttribute")
      .bases("Node")
      .build("name", "value")
      .field("name", or(def("JSXIdentifier"), def("JSXNamespacedName")))
      .field("value", or(
        def("Literal"), // attr="value"
        def("JSXExpressionContainer"), // attr={value}
        null // attr= or just attr
      ), defaults["null"]);

    def("JSXIdentifier")
      .bases("Identifier")
      .build("name")
      .field("name", String);

    def("JSXNamespacedName")
      .bases("Node")
      .build("namespace", "name")
      .field("namespace", def("JSXIdentifier"))
      .field("name", def("JSXIdentifier"));

    def("JSXMemberExpression")
      .bases("MemberExpression")
      .build("object", "property")
      .field("object", or(def("JSXIdentifier"), def("JSXMemberExpression")))
      .field("property", def("JSXIdentifier"))
      .field("computed", Boolean, defaults.false);

    var JSXElementName = or(
      def("JSXIdentifier"),
      def("JSXNamespacedName"),
      def("JSXMemberExpression")
    );

    def("JSXSpreadAttribute")
      .bases("Node")
      .build("argument")
      .field("argument", def("Expression"));

    var JSXAttributes = [or(
      def("JSXAttribute"),
      def("JSXSpreadAttribute")
    )];

    def("JSXExpressionContainer")
      .bases("Expression")
      .build("expression")
      .field("expression", def("Expression"));

    def("JSXElement")
      .bases("Expression")
      .build("openingElement", "closingElement", "children")
      .field("openingElement", def("JSXOpeningElement"))
      .field("closingElement", or(def("JSXClosingElement"), null), defaults["null"])
      .field("children", [or(
        def("JSXElement"),
        def("JSXExpressionContainer"),
        def("JSXText"),
        def("Literal") // TODO Esprima should return JSXText instead.
      )], defaults.emptyArray)
      .field("name", JSXElementName, function () {
          // Little-known fact: the `this` object inside a default function
          // is none other than the partially-built object itself, and any
          // fields initialized directly from builder function arguments
          // (like openingElement, closingElement, and children) are
          // guaranteed to be available.
          return this.openingElement.name;
      }, true) // hidden from traversal
      .field("selfClosing", Boolean, function () {
          return this.openingElement.selfClosing;
      }, true) // hidden from traversal
      .field("attributes", JSXAttributes, function () {
          return this.openingElement.attributes;
      }, true); // hidden from traversal

    def("JSXOpeningElement")
      .bases("Node") // TODO Does this make sense? Can't really be an JSXElement.
      .build("name", "attributes", "selfClosing")
      .field("name", JSXElementName)
      .field("attributes", JSXAttributes, defaults.emptyArray)
      .field("selfClosing", Boolean, defaults["false"]);

    def("JSXClosingElement")
      .bases("Node") // TODO Same concern.
      .build("name")
      .field("name", JSXElementName);

    def("JSXText")
      .bases("Literal")
      .build("value")
      .field("value", String);

    def("JSXEmptyExpression").bases("Expression").build();

};